Engine unit and work vehicle

Abstract

Two sets of assemblies are arranged such that a diesel particulate filter device of the assembly, a selective catalytic reduction device of the assembly, a selective catalytic reduction device of the assembly, and a diesel particulate filter device of the assembly are located next to each other in this order. Exhaust tubes are provided to extend upward from gas outlets of the selective catalytic reduction device of the assembly and the selective catalytic reduction device of the assembly. The two exhaust tubes are located on a virtual plane orthogonal to longitudinal directions of the selective catalytic reduction devices of the assemblies. Thereby, an air intake position for an engine can be easily set to a position from which exhaust gas from the engine is less likely to be taken in, in a configuration provided with two sets of assemblies.

The invention claimed is: 
     
       1. An engine unit, comprising:
 an engine; 
 a first exhaust gas treatment device treating exhaust gas from said engine; 
 a second exhaust gas treatment device treating the exhaust gas that has passed through said first exhaust gas treatment device; 
 a third exhaust gas treatment device treating the exhaust gas from said engine; 
 a fourth exhaust gas treatment device treating the exhaust gas that has passed through said third exhaust gas treatment device; 
 a first exhaust pipe extending upward from a gas outlet of said second exhaust gas treatment device; and 
 a second exhaust pipe extending upward from a gas outlet of said fourth exhaust gas treatment device, wherein 
 said first to fourth exhaust gas treatment devices are arranged to be located next to each other in an order of said first exhaust gas treatment device, said second exhaust gas treatment device, said fourth exhaust gas treatment device, and said third exhaust gas treatment device, such that respective longitudinal directions thereof are arranged in parallel, and 
 said first exhaust pipe of said second exhaust gas treatment device and said second exhaust pipe of said fourth exhaust gas treatment device are arranged to be located next to each other on the same end side in said longitudinal direction of said second exhaust gas treatment device and said longitudinal direction of said fourth exhaust gas treatment device. 
 
     
     
       2. The engine unit according to  claim 1 , wherein said first exhaust gas treatment device and said second exhaust gas treatment device, said second exhaust gas treatment device and said fourth exhaust gas treatment device, and said fourth exhaust gas treatment device and said third exhaust gas treatment device are each arranged separately with a gap therebetween, as seen in a plan view. 
     
     
       3. The engine unit according to  claim 1 , further comprising:
 a first intermediate connection pipe connecting between said first exhaust gas treatment device and said second exhaust gas treatment device; and 
 a second intermediate connection pipe connecting between said third exhaust gas treatment device and said fourth exhaust gas treatment device, wherein 
 each of a gap between said first exhaust gas treatment device and said second exhaust gas treatment device, a gap between said second exhaust gas treatment device and said fourth exhaust gas treatment device, and a gap between said fourth exhaust gas treatment device and said third exhaust gas treatment device is smaller than a diameter of said first intermediate connection pipe and a diameter of said second intermediate connection pipe, as seen in a plan view. 
 
     
     
       4. A work vehicle having said engine unit according to  claim 1 .